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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc577cfe60db60f77e7056a34b749fc385e47875f6eae30db548a91557dbf1b8' 
  AND token = 'tgTzJC0MoMNSYHy4YwRQUk425TY2QA464lVb5YIHnK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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