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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77cc69477c7b83c9c035856fd7b3c68bab0ae3dbdbd628bdf951221fbf32e59c' 
  AND token = 'i+7HIItaYeByctZwqGUjR+A+q/O896BS0rcX+4lNF8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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