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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90cf9af99ca60a2c574d74957ef57145cca4dc9d8a2f3d3591c7d5e2e4ae2512' 
  AND token = 'uhKOngmTYXmARJTqscs2Ljl+TrLdegZUM/84V3ASghI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}