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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1c177e4e000148112c9e963822b5cde8f810a3c0b98eeeb19050c2edfa072e0' 
  AND token = 'v85mv9k01LSt8BloW4lNJ7mPNjAF3hqnUcj/fAGjrrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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