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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d85540c36399f870b49207e8f17fa51988b5a06bdac249204bc494aded46521' 
  AND token = 'HmTl7x0fnYJB/ZYgC9Eb/HFe64it0alzc4HrHetYl5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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