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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0278daa2fb8d27a02a59e550aaa446457630e05cb7d80e64bdb195d929a0e894' 
  AND token = 'rPsKj5l83W1jJO4jA6+RwUwz777tRPGoX/uiC2Ippks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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