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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53fcfdc625544b583966488a983e4e3300503d1aa6eee47994f842dda9a3cd69' 
  AND token = 'L232S7olBxsNXry1Tyx4XOP3QTtyzk+jtHWE6mO3lgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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