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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '149b152c81da59731d9cb8889c7868f0a59eb60ed024ddfd3a6d3e8bf505012b' 
  AND token = 'jxp4fxmnIAF13Sv8Rn6MPQjnvVaQ+p4HLFMDkiYVBEE=' 
  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"
    }
  }
}