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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6f082c1e7deaa7e1883ef3d104ed65fc07ca6db5a4a8ff4d670692a61a0c791' 
  AND token = '2cG1qzaRY6jpcyT6p6ZsMFYPXPYIWgjUcgPppsaiYUw=' 
  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"
    }
  }
}