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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57b99c0dfacfb5386d1e055da619908fc7ecc7e329be9d9c66f5274120e54eee' 
  AND token = '7ZMmXlZ82gR8gq1eT1zbDd2biW92OVuc1+rC3Hc4Z48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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