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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1115c0803fbac3a2c6b51eb5408c0e159813442a07bc2a31056fd6b205a5b3a2' 
  AND token = 'G2aYQx+DngOW1jMmIYVd+5cFPNjVVVOR+rH7Xd0UH54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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