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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53aebf9bdc222c4e19d1e744e4889ae17aa683d98f46e632b03b9062982e6f0e' 
  AND token = '39zSPmAdf3OWDM5rNYUN7LPg+1VjN4Uj69yCiG3meEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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