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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '784aa08eaadc9a4749bd5a740027a4be648e24bf5af168136c5bba710038017b' 
  AND token = 'DCSJXiv+XAPzam4P5hP4d646ZpvIMKMzxiJ72ht9d/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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