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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53c46371a121e4a470723ecc40fc3c53addc4d417e4142e9f8f1eb1918a707c7' 
  AND token = 'cYgiyI6XkY5bSBWhM3siPkdKrsooxrUmnnncyGL3b/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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