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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '540b26809daaaae1a9ffdeb533cc7b42d10a9bb85c8c71bf0cd9e137158bc242' 
  AND token = 'iIIDhBE4cfQzkDkEm++tlx+g/SErB07J/Jk8g2E/mIQ=' 
  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"
    }
  }
}