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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91529b81536aab88f608bf53216c4e4455523347e3e4b1c42f2c42dfdcfceea7' 
  AND token = 'b8AXgZp3JCv4crY3Q3WpcTPpoyXkXnqc9BQhVT9wbFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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