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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b79ad19476c863cd642b9c2358e465c4627061e5111ffe98a195544079e05a1' 
  AND token = 's1ByjYLd0fGdSQUSdN6fwvqQvBCVW0w+UafxLEdirkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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