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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59ba9d45b04eb17a9cdaf16240686aa62e0dd50ed001d4fc86eaa0f7a53f2c5f' 
  AND token = 'lRGPT8JzCpM98KOLYQ5UMW0Dpzdng+wyHbPEXRVCA2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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