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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eec97cb9075f6e6f0ae04620a197fb920b2bd89c93de0a7d0ec1d8bfad7d3d74' 
  AND token = 'dJwrTKVN4qmFbRjd1aH0OETBzHJ8yv/DkGTCbcejrIA=' 
  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"
    }
  }
}