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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '295b63ed6e3387f2a6e99ccd9c4075af5aaba2db1ee62367fa8068fa55a47ca2' 
  AND token = 'uS3MyuqrEqRLV0CBdi1K8ZSv93kXsSgtKq7X5Ditg+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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