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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b6582cf33c1613246dcb0fa18434e132255bfeeb0b758fb344d36c275de2ea1' 
  AND token = 'vpva9f3oTIDW3pg/3oxfUNjUV8BM6vZocey4z5N2DOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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