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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e34a1a993a2c87efa2dd8711108a2d6f11c31de06c6ab4b7d0720e10f86afc9' 
  AND token = 'REamBYB6cE2S2birxIqDlVsga7oTEJVFn/BHxOFdp9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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