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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7478efabddd0b875ec840369421327476f4161837ca205c22e07e42e2fd0d6c1' 
  AND token = 'oF3eWWQTROIHG3xnYEFmBal+D5b28u4R4lSlZcs3Jd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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