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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd69b3c8784cffc62c4bcc6769a2dd7921341db557dcbb14b45fcb66bb1d12867' 
  AND token = 'E7VS9+cJUlY02LDO50tZEXGVBLmz3b6f241lTAHDEi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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