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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2bc4a5e1ffcd77b851a25cea9d20d99634bdd5994fb7d4ec6bbc0b16d09dc00' 
  AND token = '5dYS9oeftGu79rRcBWEsG5Wqu+P0YJGHY0X+QZeNKkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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