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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca65716cc9a5e4546cccc1f139c2d5e58dc38e75d7786a7eb07248551e8b5bc4' 
  AND token = 'mKrkm/DHtgg+PFYnUTdcE4i6F02sANJKESi9xe0s1/0=' 
  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"
    }
  }
}