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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e001ab7c7330918f793eae065dde22e2f190e3dbe85b745bf9457f7c55fba37' 
  AND token = 'vmrUfoMUQF54UIpz8wK+FbDS5A+5Ez7kE2worZ5RXkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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