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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8ae802ebec3b37b4a54dc9990b7ff5d438b67efc7d5d14771beda5033f4462c' 
  AND token = 'lkIMPEhRPHA93setGs+ilm0+kjRj/zL9gnxtoosaqhQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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