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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1acd2eded98841d1b8c734f2a0f77542969cf80669c51ef3f52964dc4ef0a871' 
  AND token = '+U91joiLK8Z3IVQHx4P3FRYit1Re80e+1JpudnOWYDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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