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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb0258fa177a95d0cee1a8a3be11caa16117049d318b88728159c06add576ecd' 
  AND token = 'tZkJq35u5tQow//88wM22KME0D1huUERaJT7J2THDFI=' 
  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"
    }
  }
}