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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6136e69d7e3fece83bb2f3f87dc24f007db43202758db70e46a867c1da0717f9' 
  AND token = 'NJOoKwbqIFWVrItt83DtgSGlfmxU5xL11IpKA7eLT2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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