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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c09d528e854178954f73561fbe1de1ee8f12fec242c4c6116ac28b7daefd63e1' 
  AND token = 'd25qNbT9YXs+fJJcIBKC562YHqfJ92I2WIHK+kX66nY=' 
  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"
    }
  }
}