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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be288a5b4524d6a1cde2f3cb6a5d4bbfeca366702bcf027a3c27a96953fa3fa2' 
  AND token = '60thjgLR31S47ZFmoEb+2ggEgPYCdGXE4gDSrrqHt2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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