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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ee5fec46c3509d6d9ec9b8c65fea7c4b88fc0166596915d1f12765c1cbfc0e2' 
  AND token = 'vFM0AHwVlh565Qz+H4gbycZ5midTPYQFGj43ca7Q8+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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