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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85e1ce8baa61a60040660149a5cdcaf35b547c1c52182504648cde2c224d6d6a' 
  AND token = 'fdJszxi4gg2217ujxBGwmHu6IjmjYX5SoBlKN+4jW3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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