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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab5fdaa6a007297cbc9c616597671d9b26847f9b7f8d5953db18dab758710373' 
  AND token = 'ybaj93bGT4l7zB0CtAgeqxpzmiCXCahJqH+9XnpnnVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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