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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b6ea0675787bbc9541aef4d39f187ca2c1607c616154a7db54f0cdf1ac10b48' 
  AND token = 'I7yQmlDqBG0p0IbzQxu6xYSDO/fDGgYtj71IhZWNNuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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