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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00364c11ddc5506493e45b38701fb5cb9d174465b58da93fb4d80c07b3a93c39' 
  AND token = '/jd6ScKWylWVpZesVqtd6bsWdXy5mPYzc8bALThJ6+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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