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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a2b2b06b65e12a0a90cfb8d48eae5fcef06ab412f6628ab50d41cddf7998919' 
  AND token = 'eHgKhlonvSweo6GNeMF7vJ7ibQ8U2MHHASozTZXHXJg=' 
  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"
    }
  }
}