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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aba592f3111cc284d89b8d479cbec970e3beae50fb0cfb57b155aeec10666f63' 
  AND token = 'd3mPyh3Wa6Ep4ET3juR76Kb0D/O34YDp6js4AJ+aKLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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