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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5ab73cf2d5e153a95f048d30e101383229f9d636a4b2e70d5733f6d80236036' 
  AND token = 'i46+5XtH5yV6PW6ACM2PIlESGdY3j+3Xar/l3uw1074=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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