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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bde1f5dafe047bafd1790bfa7d4dff0ff7ba64024a0beeaf96fd071c521229b' 
  AND token = '3K854w5Zw5qPguI/pqBh+rw/BOOLTAE/417tKxl3QBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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