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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fdcb195c00dfd76142204371b714065f3686f1c9a27fe3565db93f9ec30d7a5' 
  AND token = 'z1BO0uRU78zc4i3NxujmHy44Dl4xeBB0O/MU0Lzqr1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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