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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91e194e8674f4471a8120d7330792b19355e7c537458f3b3e2abc188271ccd81' 
  AND token = 'gQi27xmkkEMwtc9drz6exNvjk012FzbDnr8vh9UjTQA=' 
  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"
    }
  }
}