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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f378a55557fc45b13864ab6119da08f113a7724e86380edfc3f542ab9092d917' 
  AND token = 'F09bb3agtHZ7Kir5rD1VFtSr1jSpLpmxQyX2/0iaJrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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