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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5491fa815b065b999a6f3d5a3955672d908368c5d80dea594d461bc69c965a9e' 
  AND token = 'sW7kYvLlcUjAmNtKoVSHT8T51XkBVVMo/8W8RXpwdjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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