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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bef8727efec51948645791107b97cf37a83596b111e5db87f7a57b12e3d8e52c' 
  AND token = 'pcsmVjPObAwTe9VbAiEnB5pgSaKz4iI0go1wrXL6API=' 
  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"
    }
  }
}