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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3df781df46a702c8010f12ff4950a02cdfa679d45e566575ae3948dc7d31c94' 
  AND token = 'YIM71Iy68XZsPh37sHBKbzs/2BJfRddJumazQAIGbkk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00072

JSON explain

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