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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '247a3e7e67c498a16ae90c91f26a5ca4fae1eda4f96b84540014a922902d5c36' 
  AND token = 'dupPoLUSQTNLciHf3dmJBdrZAyt2i1tV80pGNGbEP2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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