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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e750df4374399e6ec47bbef46d466a23086d1156c5fd716899351ef2b5a509ae' 
  AND token = 'kFbBsVH9TAHNwJ0/Rhv0Pp4hU81w18nVivjnLV10F8w=' 
  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"
    }
  }
}