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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '538a8a6b98e2fe33486b5b4078d67a1b4f4bb7f565fc3335d988f3c221add86f' 
  AND token = '0NTNpm+843yEbQxD2iS8H0/LjB7A1vjyh1S0pn1cqkc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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