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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b55f8e1f7a67ca02ff0a1fb1c45ce8fdfa5722bc8310489adf4c3f0cd64b5f6d' 
  AND token = 'p+yb6w70Z/rbk4vHq11Zl1Vt9hM9p9cvJEV82xXDjmU=' 
  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"
    }
  }
}