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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c280fdd602eb65ca713f8e44c538369ef3888ca1f0bcfa646d7d4711157f0f49' 
  AND token = '3CAfxWk5Kx4zmeZ30EFJKYp5evvPRdPHN77J4yObpNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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