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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9b747dc13b264d0bf01ee355c18fa9207be5f1de15c32527069b31a667cfa8a' 
  AND token = 'E67YLpFjcKfs3RDXOnRPsc2fufY2rbJbUcsTX/X38WU=' 
  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"
    }
  }
}